body {
    background-image: url(../img/login.jpg);
    background-repeat: no-repeat;
    background-size: cover; //背景图适应屏幕
}
.input_box {
    width: 200px;
    height: 40px;
    padding-left: 10px;
    display: inline;
    margin-top: 20px;
    margin-left: auto;
    margin-right: 10px;
    border-radius: 5px;
    border: 0;
    outline-color: #8ea4f8;
}
.button_box {
    width: 200px;
    height: 40px;
    display: block;
    margin-top: 20px;
    margin-left: auto;
    margin-right: auto;
    border-radius: 5px;
    background-color: #64a9d9;
    cursor: pointer;
    color: #fff;
    border: 0;
}
.insert {
    display: flex;
    justify-content: center;
}
#add {
    display: block;
    text-align: center;
    margin-top: 20px;
    font-weight: bold;
}
.select {
    width: 200px;
    height: 40px;
    display: inline;
    margin-right: 10px;
    border-radius: 5px;
    outline-color: #8ea4f8;
}
.update {
    display: flex;
    justify-content: center;
}
#ud {
    display: block;
    text-align: center;
    margin-top: 20px;
    font-weight: bold;
}